Which of the following is NOT a pair of co-prime numbers?
22, 24
The correct answer is 22, 24.
For example, for 3 and 7, \text{LCM}(3, 7) = 3 \times 7 = 21. Consecutive integers are always co-prime. For example, 21 and 22 are consecutive, and \text{GCD}(21, 22) = 1. The GCD can be found using methods other than listing factors, such as the Euclidean algorithm, which is very efficient for larger numbers.
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